Leg and body pain

[Jaaikrisnaa]

l have gall stone ,last two years I am taking ayurveda medicine's ,last six month back ,I get leg pain in right side but pain is not in one place some times in the knee,other time in the ankle ,at the time when I walk, I feel heaviness in the leg,doctor said this is gas and gave some medicine now pain is in the knee regions if I am sitting long time in one place ,around my knee cause so pain I have fear in my pain because some time hole body I feel pain ,why?

please give suggestion's.